/*!	 valuenode_linear.cpp
**	 Implementation of the "Linear" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "valuenode_linear.h"
#include "valuenode_const.h"

#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include <synfig/color.h>

#include <ETL/misc>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Linear, RELEASE_VERSION_0_61_06, "linear", "Linear")

ValueNode_Linear::ValueNode_Linear(const ValueBase &value):
    LinkableValueNode(value.get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    Type &type(get_type());

    if (type == type_angle) {
        set_link("slope", ValueNode_Const::create(Angle::deg(0)));
        set_link("offset", ValueNode_Const::create(value.get(Angle())));
    } else if (type == type_color) {
        set_link("slope", ValueNode_Const::create(Color(0, 0, 0, 0)));
        set_link("offset", ValueNode_Const::create(value.get(Color())));
    } else if (type == type_integer) {
        set_link("slope", ValueNode_Const::create(int(0)));
        set_link("offset", ValueNode_Const::create(value.get(int())));
    } else if (type == type_real) {
        set_link("slope", ValueNode_Const::create(Real(0)));
        set_link("offset", ValueNode_Const::create(value.get(Real())));
    } else if (type == type_time) {
        set_link("slope", ValueNode_Const::create(Time(0)));
        set_link("offset", ValueNode_Const::create(value.get(Time())));
    } else if (type == type_vector) {
        set_link("slope", ValueNode_Const::create(Vector(0, 0)));
        set_link("offset", ValueNode_Const::create(value.get(Vector())));
    } else {
        throw Exception::BadType(type.description.local_name);
    }
}

LinkableValueNode*
ValueNode_Linear::create_new()const
{
    return new ValueNode_Linear(get_type());
}

ValueNode_Linear*
ValueNode_Linear::create(const ValueBase &x)
{
    return new ValueNode_Linear(x);
}

ValueNode_Linear::~ValueNode_Linear()
{
    unlink_all();
}

ValueBase
ValueNode_Linear::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    Type &type(get_type());

    if (type == type_angle) {
        return (*m_)(t).get(Angle()) * t + (*b_)(t).get(Angle());
    }

    if (type == type_color) {
        return (*m_)(t).get(Color()) * t + (*b_)(t).get(Color());
    }

    if (type == type_integer) {
        return round_to_int((*m_)(t).get(int()) * t + (*b_)(t).get(int()));
    }

    if (type == type_real) {
        return (*m_)(t).get(Real()) * t + (*b_)(t).get(Real());
    }

    if (type == type_time) {
        return (*m_)(t).get(Time()) * t + (*b_)(t).get(Time());
    }

    if (type == type_vector) {
        return (*m_)(t).get(Vector()) * t + (*b_)(t).get(Vector());
    }

    assert(0);
    return ValueBase();
}

bool
ValueNode_Linear::check_type(Type &type)
{
    return
        type == type_angle	||
        type == type_color	||
        type == type_integer	||
        type == type_real		||
        type == type_time		||
        type == type_vector;
}

bool
ValueNode_Linear::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(m_, get_type());

    case 1:
        CHECK_TYPE_AND_SET_VALUE(b_, get_type());
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Linear::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    if (i == 0) {
        return m_;
    }

    if (i == 1) {
        return b_;
    }

    return 0;
}

LinkableValueNode::Vocab
ValueNode_Linear::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    Type &type(get_type());

    if (type == type_angle
            || type == type_color
            || type == type_integer
            || type == type_real
            || type == type_time) {
        ret.push_back(ParamDesc(ValueBase(), "slope")
                      .set_local_name(_("Rate"))
                      .set_description(_("Value that is multiplied by the current time (in seconds)"))
                     );
    } else {
        ret.push_back(ParamDesc(ValueBase(), "slope")
                      .set_local_name(_("Slope"))
                      .set_description(_("Value that is multiplied by the current time (in seconds)"))
                     );
    }

    ret.push_back(ParamDesc(ValueBase(), "offset")
                  .set_local_name(_("Offset"))
                  .set_description(_("Returned value when the current time is zero"))
                 );

    return ret;
}